







418 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
Record of after-shocks — Continued. 
Day. on Nea! of | Duration, | Intensity. Locality. Remarks. 
hi, m.. 8. | secs 
Apr;25, Dali) g05k 7540 ees oe ape II-III} Mt. Hamilton .... 
ech Oe aes) eae ge | See ce Berkeley. soe. 22 2 tremors about 5 s. apart. 
Epa . Time is of last one, B. L. N. 
3: 20 wee rea hia 5.<.2 = ee Oakland see acer Alameda Pier. 
B20 save oe aloo ae ATUIOGM 5 See eae 
ee ee ee es Mr a kas Nileas ia: bee cee Many shocks during month, 
Wee. 
Apr26, 8:00. | \Bie20 -oee ea ee eee PSUNRS Zl. sce fue 
| LO V2O SRS acct soa mec Scott’s Valley .... | F. L. 
LO%23 it on eee San WOSe.- een ae 
10 20. Se eal Mitek, oe eee Oakland... 3 055.5 Explosion? Chabot Observa- 
| tory. 
10 S338605. cece es II | Mt. Hamilton..... Jolt only, no swing, R. H. T. 
Apr: 26/p: 1m.) Sea S See oo ee eee Mile Roecks....:.- Slight. 
"5, ee ete IW Pres) ie | Saratoga .. sek Like explosion under foot, 
| | similar to shock of Apr. 22 
| at 11" 30™a.m. Light. 
| AO. ee ee eee hoes uae |, soarears b Salinas. ssa aetoae Very heavy. 
| SO sae Was haeeret= GO ee eseee 
OS35 Sarees | ad ee oN eae NilesRocks 352 ae Slight. 
Se eee ae oe 2. alas 22 recta Other shocks reported, but not 
recorded. 
O85 Olea 5 thee) Malate ats GOhs. ataae Very heavy. 
9550: senee ee ae ee Mile Rocks....... Slight. 
POPPY RC RCO Rs ore | AS ayes ih odes SNAG. ees ee Very heavy. 
ee aes ja” BAe I] Oakland 2 see Chabot Observatory. 
10 BOe sees 1) ene) Ae Ferndale ......... Sharp. 
110 80.535 .k he tee wwe i Sere Buteks «cep uwe Sharp. 
Apr, 27, ).M..\) st07 eee. seeies 4-2 0] ee eee CATCIS Or A. G. MeA, 
| 1 09 34. EY iat Berkeley ......... Rete. 
d LO. csatewAh? |. ssa. | eee Eolister ats sae 
L Lee tesa. oe: Aerts rele aes And many others. 
| 1008108 ae II] | Oakland.......... | East to west, Chabot Observa- 
| tory. 
Apr, 28,8, tia) 12° Sich escent eee ae faa. 5 secs ian a0) | SEAR cael oe 
| Apr. 28,p. 1s oh: AO 2 eee ee are ener Scott’s Valley .... | F. L. 
Apr, 29,8.™m;), 4765 ....e-e Dose els ee ee Mile Rocks....... Vertical. Strongest at mid- 
| dle, sound like cannon shot, 
| coinciding with beginning 
of shock. Sharp, following 
strongest disturbance 2 s. 
Die eee 2 = <a eee Coy eee 
Re Weide Site ss Winton Paisley, Oregon... | Milk spiltnorthwest-southeast. 
About 9 a.m. 
| 12220... ae i t-sle Seve oa PT ge Scott’s Valley .... | Hard, not long, F. L. 
Apr.29,p.m.| 4.08. 22200) ae ne OG,.e0 450 se th Hard, shook house well and 
lasted several seconds, F. L. 
| 4°00 2 eee. scene eee San Francisco.... | A. G. McA. 
409° 2020.8 ns yee Mt. Hamilton .... | W. W.C. 
1 OO SEP a reeneer eee Oakland Jen. CB, 
+ Apr.30,8. mo 1 4b. eee Do, 2 seule Mile Rocks....... Slight. 
We Pe ofen Ss Sl Dn ats eile tere Goi. a ae eee 
1 ya ae ee San Francisco . A. G. McA. 
LD 30. cama See cee ee 73 Fe Peg eg Single swing, A. G. McA. 
2 OY 22a eae eee III | Berkeley......... Northeast-southwest. Short 
and sharp, R. T. C, 
< hD. coisa es seen See San Francisco.... | A. G. McA. 
7 420 2g ta eU on cee ee Oakland...... .... | Shocks from this date to May 
| 17 seem to be of circular mo- 
tion. No decided direction 
shown by Duplex seismo- 
graph. Tremors, vertical mo- 
| tion predominating. Chabot 
Observatory, C. D. 







